Telephone



Nov. 23 1926.

E. 5. LONG TELEPHONE Filed June 7, 1924 2 Sheets-Sheet 1 gwuento'a Emmff 020519 Patented Nov. 23, 1926.

UNITED STATES Z PAT ear orrica EMMET S. LONG, OF VERNON, CALIFORNIA, ASSIGNOR TO THE LONG TURNEY COR- PORATION, OF VERNON, CALIFORNIA, A CORPORATION OF CALIFORNIA.

TELEPHONE.

Application filed June 7,

This invention relates to telephones andmore especially to the construction of theis quite as important, is to minimize breakage of the mouthpiece. The importance of this will be readily appreciated when it is borne in mind that the cost of replacing broken inouthpieces amounts, in the United States alone, to very large sums of money.

Another important object is to provide a construction of transmitter that, when used on a desk phone, will greatly reduce the maintenance cost of such phone.

Other objects and advantages will appear in the subjoined detailed description.

The following drawings illustrate the invention:

Fig.1 is a front view of a telephone transmitter constructed in accordance with the provisions of this invention.

Fig. 2 is a rear view of the transmitter shown in Fig. 1.

Fig. 3 is an elevation, mainly in section on the line indicated by 3-3 Fig. 2.

Fig. 4 is a fragmental sectional detail on the line indicated by l4, Fig. 2.

a Fig. 5 is a rear face view of the metal insert of the transmitter.

Fig. 6 is an end view of the metal insert of the mouth piece of the transmitter.

Fig. 7 is a side elevation of Fig. 6.

Fig. 8 is a rear face view of the bridge of the transmitter.

Fig. 9 is a sectional elevation on the line indicated by 9-9, Fig. 8.

Referring to the construction of the transmitter, disclosed in Figs. 1 to 9, inclusive, there is provided a transmitter face insert 15 of metal and of circular construction, provided at diametrically opposite points with rearwardly projecting lugs 16 which may be of integral construction with the The outer surface of the in-' member 15. sert 15 is provided with a soft non-metallic covering 17 of sound-deadening material such as, for example, soft rubber which is molded in place upon the insert. Preferably 1924. Serial No. 718.495.

the insert 15 is provided with a number of perforations 18 through which the covering 17 projects so as to more firmly hold the covering in place. The same covering material forms an annular flange 19 which projects from the rear face of the insert 15 and covers the inner faces of the lugs 16 as clearly shown in Fig. 3.

The flange 19 is provided interiorly with an annular shoulder 20 against which seats a transmitter diaphragm 21 that is thus separated from the lu s 16 by the flange 19 of soft sound-deadening material.

Secured by screws 22 to the lugs 16 is a bridge 23 of firm, non-metallic material such as, for example. aphenol condensation product. The bridge 23 carries the resistance unit or, as it is generally termed, button, indicated in general by the character 24. The button in detail as its construction is well understood by those versed in this art.

The insert 15 is provided with a central opening 25 to admit sound, the wall of said opening being threaded as indicated at 26 to engage the screw threads 27 of an annular mouthpiece insert 28 of metal. The insert 28 is provided in its interior with a wall 29 having perforations 30. When the insert 28 is screwed into the insert 15, a portion thereof projects beyond the outer face of said insert 15 and said projecting portion is embedded in a soft sound-deadening funnel-form covering 31, only the extreme inner end of the covering 31 engaging the insert 28 so that, in the main, the mouthpiece is soft and flexible. To insure bonding'between the insert and covering 31, the insert 28 may be provided with perforations 32 through which the covering 31 extends. The covering 31 also preferably extends along both faces of the wall 29 so as to cover said faces. To further insure bonding 24 need not be described between the covering 31 and insert 28, said insert is provided on its outer face with an annular flange 281 knurled on its outer face, as indicated at 282. To insure against sweating of the diaphragm and to prevent damping of the diaphragms vibration, vents 283 are provided in the mouthpiece and said vents extend through the covering 31 adjacent to the :screw threads 27 and through said screw threads to the inner end of the insert28.

In order that the transmitter face may be secured to the transmitter shell, not shown, I provide curved metal inserts 33 in the flange 19, the ends of said inserts 33 being spaced from the lugs 16 and the material of the flange 19 filling the spaces. Slots 84 are cut in the flange 19 at intervals to e pose the inserts 38 and at these slots the inserts are. provided with threaded holes to receive the screws that fasten the transmitter face to the transmitter shell, not shown.

hen the transmitter is in use, any sounds extraneous to the mouthpiece, will strike the soft coverings 17, ,31 and be absorbed thereby instead of being transmitted to the diaphragm, as occurs in the transmitters of prior construction, even though, in the prior transmitters, a thin piece of fabric is placed between the diaphragm and its seat. Such thin piece of fabric affords very little protection to the diaphragm against receiving extraneous sounds through the transmitter walls.

By making the bridge 23 of non-metallic material, I eliminate many pieces of electrical insulation necessary when the bridge is made of metal.

If the transmitter be that of desk phone and the phone is koncked oft of the deck or other support, the mouthpiece will yield when it strikes the floor or other object and will not break as is a common occurrence with those atprsent in use. Even though my new mouthpiece be used. as a substitute for the mouthpiece of the old breakable type of transmitter, it will be apparent that the resiliency of said mouthpiece will ordinarily amply protect the transmitter against injury in case of the telephone falling upon the floor or being accidentally struck. Also my new mouthpiece, when used on the old type of transmitter face inlieu of the old mouthpiece, will to some degree clarify the transmission ofv sound over the telephone, since those external sounds that ordinarily are received by the mouthpiece and transmitted through the face to the diaphragm, will be absorbed by the mouthpiece. It is to be noted that any vibrations affecting the telephone shank and transmitter shell cannot reach the transmitter face because of the spacing of the screwreceiving member 35 from the face insert 15 and lugs 16.

It will be apparent from the foregoing description of the invention that my new construction has several advantages that the prior constructions do not have. The coverings 1'7 and 31 absorb extraneous noises and insure against breakages; the flange 19 prevents vibrations being transmitted from .5L 1 a sort sound-deadening the transmitter face to the diaphragm and the transmission of vibrations from the transmitter shell to the transmitter face and the bridge :23 eliminates the use of many pieces of insulation formerly necessary.

f great importance is the fact that the mounting of the members 33 independent of the lugs 16, prevents vibrations being transmitted from the transmitter face and from the transmitter shell through the face to the bridge and thence to the extremely sensitive button.

I claim l. A telephone transmitter comprising a metal insert having lugs and a sound-receiving opening, a rigid non-metallic bridge secured to the lugs, soundaleadening covering for the outer face of the insert, ann lat-flange on. the inner face of the insert covering the inner of the lugs and having an annular shoi. er, a diaphragm seated against said shoulder and positioned to receive sound through the opening, and a button mounted on the bridge in operative relation with the diaphragm.

2, irtelephone transmitter comprising a metal insert having lugs and a sound receiving opening, a rigid non-metallic bridge secured to the lugs, a soft-sounddeadeniug; covering for the outer face of the insert. a soft sound-deadening annular things on the inner face of tie insert covering the inner faces of the lugs and having an annular shoulder, a diaphragm seated against said shoulder and positioned to receive sound through the opening, and a button mounted on the bridge in operative relation with the diaphragm. I

A telephone transmitter comprising a metal insert having lugs and a sound-receiva rigid non-metallic bridge mg opening, secured to the lugs, a sort sound-deadening covering for the outer face of the insert, a a

soft sound-deadening annular flange on the inner face of the insert covering the inner faces of the lugs and having an annular shoulder. a diapl gm. seated against said shoulder and positionet to receive sound through the opening, a button mounted on the bridge in operative relation with the diaphragn'i, and curved metal inserts partly iinbedded in the flange and having their ends spaced from the lugs, said curved inserts having threaded holes to receive crews for securing the curved inserts to a transmitter shell.

} Signed Los Angeles, California, this 26th day of May, 1924:.

EMMET s.

LONG. 

